Now, my feeling is, that as fungus and cactus get more and more entrenched into English eventually these formal endings are going to fall away and we're just gonna have this regular plural.

现在，我的感觉是，随着 fungus 和 cactus 在英语中越来越根深蒂固，这些正式的词尾最终会消失，我们只会使用这种常规的复数形式。